<!DOCTYPE html>
<html>
<head>
<script>

    function f(event) {
        document.removeEventListener("DOMAttrModified", f, false);

        // dumpln(event.attrChange); /* 2 (MutationEvent.ADDITION) */
        // dumpln(event.attrName); /* "curpos" */
        // dumpln(event.newValue); /* "0" */

        // (gdb) break nsGlobalWindow::Dump
        dump("[[[[DOMAttrModified\n");
        document.removeChild(svgUse);
        dump("]]]]\n");
    }

    var svgUse = document.createElementNS("http://www.w3.org/2000/svg", "use");
    document.removeChild(document.documentElement);
    document.addEventListener("DOMAttrModified", f, false);
    document.appendChild(svgUse);

</script>
</head>

<body onload="boom();"></body>
</html>
